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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea6cdf46e51d5b6bdc77526797c3b725df39dc128643ceffb1d523cbc56ec43' 
  AND token = 'Zl7g82PEvJ4rlYfnPaL1/4Zjl89DojqtereLEYXb0g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}