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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5eee9a423a82d941ecb2207f438cdc7a3eb8ebdf7164217a09370a2d2d86fc' 
  AND token = 'i8xMWcCfcK/Fanqo8Soe5t0wV0LxYPEwQBcBpAq9Xdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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