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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab202ce285e36997e1f1795ba210a3245f8a00a382a58e4444514127aaf9704f' 
  AND token = '0Csc9Z1grJOuUtlPiMSjMUPWQOLmRl726NtGddAL6iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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