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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db31ab13d284029c18c9652a3d4b7c565b41ad6d4077b6efab3af83500fef34' 
  AND token = '5HN5KnBdLv73ryT3smBkAj0Dg4c/LWXDubYpIHqVr7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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