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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46cc8a5c25d5d0f0aa5c61cba6fd90bfea5a2d09e75f7a2b65c2ce3e5af359b' 
  AND token = 'zuvtOy7m2Ozs/qB6SrSWpq58lawcELQIGIeGigm3org=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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