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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf2befbddd0d015e83b9f0f0475a354fdf95ce991d0779de212d6bce40d5c24' 
  AND token = 'Ow9AJwCmrrkh/A11iVDHBBxlF2p+kRyxA+XCbb6sies=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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