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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e7093bd7bf6d2b2fe70121233a017133269745f9d883be3642e147ad8cebb0' 
  AND token = 'k/5R5drnzN0xy9pt8kV5nIjTA5CIn9Een1rA9WOBR00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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