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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c7675cca314c2be2069e13fbb5c459bc048a1755a5321063f7bf57d7e7ff20' 
  AND token = '53RtyXD/XbzHDLBJBzb/UOroBXLZsKxyt/EMfzR9RXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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