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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'accea5d61f17fbb73022e69770ff5d7ea437324139d70f77b8e9847b8e595997' 
  AND token = 'Gl4Z977fVQ3pZREV2lfdyKbnx/x29DivsadJfGkNXYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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