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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9404d8d8c01ebeb54c395076921b6f2d1f142da1da2212e41f774e47cb5c0d67' 
  AND token = 'Hx1IrCfo0nBjPL75mKV0/Q08hobb5lJefkin80zoTrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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