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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4f38ab4fd9596b237389dfdd4afce8956aa5a33bb15bb4c184f1d4c52d4c3c' 
  AND token = '3c8qyYrHDHHeNS52zf9ktTjnoF76W/dvozP894ryO1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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