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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ffc159ea8caf5833cf07a363d4139490e8f7afbc679bfc18aa65b19c1461cb0' 
  AND token = '893OZuN+Ni6y6tjoplelon6UqGp9Id+3vSULS8P+XxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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