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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50aaee6aa0dc0127af2e1cc11dcbdd06e30639b3457fd1bbf6cc4d8fb394b8cd' 
  AND token = 'otJrVJNfYu93hZ/8X1qEjrv3NkQBCqSP2wQL5ywfkwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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