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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a6aecf738c04890ddd6bcd6f7a06cc69764f6c74fc76392e400feed97b34eb' 
  AND token = 'V3K9h2Kb5ZW5PkGOSUpme7X+rewUnhSfL9yl2tj4x80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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