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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16d468db83d77c809966da2d6b28f826548e4b0ab0d865cfd8b6a754229be00' 
  AND token = 'xT2IHI7erNieh6Jh5kke+wUG8nfzF5xuZtrTOd4J3N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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