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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316a7bccc50c55ecc52c9362eec62cc1868338c539bb2c270359fe693b8ba1eb' 
  AND token = '+itaepLQBa2oNSKs+oNJQna91vaY/5y4voA7JZwfu1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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