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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7cf1b3de96e2c33701355abab9c812156d23ba2577170a777f84d0d3f2a0fb' 
  AND token = '6VzMb5qUXICnHxnCrC1PTZHI7gejbDrropj/xZmhTqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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