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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a4a6d5953f4b4f1ee09fa0c5e49aead73ab2be0ea019ef9ac4ae153b70f568' 
  AND token = '08jvGrRITZo4UfoDqdiq0TEN9GBqSDZ+o++sKo5p4pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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