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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3a54e257335bb86ae1fd0fb7c1e366bb1ec8c3a6fa294dd1e94dd4ac56bc56' 
  AND token = 'tu7T3eo1BJIvmimgXcGBn4CCITbNT047xp5xxsBQIMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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