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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50c19f4cdf54b0afcac4cfa96e754685e88ab1b315f15b12200046b1eef9d4a' 
  AND token = 'Dos1gjcNTbIIiuak4H2bhHjKH/qNnulFG1bOJrTacog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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