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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bb6c9805d12bba00f0d21f6eda00fc929f7a990d4e2e51b6c70e5d87eebeab' 
  AND token = '9rzyNIUR5MkXkvvdx8Gy11uFYdaOcHONLieboZ9Zrag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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