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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9925d247fa944078251273d0c81af4b6ef0cd52da1a81cfa6c9038b6fb782d2' 
  AND token = 'RcuPhaNhUbi9ptNUBsocRflc5cPhOudrUQG5Dhxc+WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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