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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096ec745bcbd4c9614940bb123b78cee23c7a8185b08341ab365f9a4c7aa9406' 
  AND token = 'jwlqrQPKm8BEBiINW1lI6yX+7CAz5AEQZ4jpd566MXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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