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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ee32979b7b6a0c2f56407625992ae3b35e936315e30e7ac9f15bfc663fed84' 
  AND token = 'O62FIn/yzJ8yUyjyLUHK1CCQhNmHyQEwfomA3iCxWCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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