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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4fe7542b25e7ab384a69b234ee22b219d567d9ce7d7ecdb5183ea98d4a0772' 
  AND token = '2wlintjt3Tgh0m9a8ErA0PWx606SMj6BDGuJ/rmVT2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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