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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3335454a5715e82c30f19185fc2924ffb7046b50d1e90e5bc7035f016cca2c44' 
  AND token = '5pSHIk/QSjbi/6QN1a+5Qvx2f01ZiR5aOyQwfhwUaqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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