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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787d621af1c064da5e3d89d37369b45c9ecd7cac212204b106353ad3ae5c4eec' 
  AND token = '2BUaPahTpQjrIiWu4JQV0crkq8dgT0Gd4zHlrB2qG98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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