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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367636ac33cb8b4ce9879747a2a09bfd860896ca6a6804ce6f50c0e6e562183b' 
  AND token = 'KRqiUxNmk42MSasRM9UQwnzeDxX5wQi0t7Nk/7OPl+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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