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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fca6f6880f96e4f985a5b6cc0ad81435b15b26646b700b21172389b2186a323' 
  AND token = '9le20epAF8d+Cua1mTjz95eo243Yv3Z42dla6OXVXbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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