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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce0aea12e0f6dc1ce97e4a9b48f0833752c829929173cefc535a8949dd040a7' 
  AND token = 'c4Use1bZno3L77yESelplnh5Z4ys778hAERTqNz8074=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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