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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc6a36cf336300275a3b0f5564a4c57a35eac7407480391bffb144f94ad8212' 
  AND token = 'PIq2lShyonUIqS3U0veO8/ZzpdlXOMrM0boZ84lmzas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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