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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32baf52b795003c0c23094a682370d3cb78ad394c8f72cef38d89225b63c54bd' 
  AND token = 'N2w0WQVN21aWHAldy6L+A0DNc9CxmKn8jBo9gsZbyKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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