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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69fbf0f700bd47d780df722ac49e71ae3c5de4f7a05e7cdf0c3fe671117ec93' 
  AND token = 'NFJAhQoCSs+cqZ6+MHaKWXy98v+3l/SciWKhM/aYN+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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