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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705c1f2abd6acb32a22c5d15ab18cc260b8d4606c4c546635dc9f978e0eb90ce' 
  AND token = 'dJAdUvPjUX2mUSGLDC5DTRuNN0mbZP0dO4a30caE/T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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