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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b040f90b6d65adbc1f78d2808099a392ff7dfef4734fcf37f018788439183a8' 
  AND token = 'zRYH28IoTN5nSyoz3oBDVfS5Qd0oiBxB2mCoUPcHWYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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