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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3ce41fecc6b8c2f10b4b35344f76351930b874a783683f0533a374e54e2353' 
  AND token = 'PW0eAqLYV+wGNhABHTKqHiYKFBISy+UfcePREQGOM1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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