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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c311ba2ad9e789769bac06d2bee73a5a22a49dfb7ff890792cc87f68e01501c3' 
  AND token = '+Kcdhmg1DJ09GZbwpy33b9aFB06ht3zKU56TRw1Vucg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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