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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b197d37710296532fc50a42af1d95949032c3d698a365cb75b86127c9742db59' 
  AND token = 'UD2KBkDNuN8EbEITcU0G7ZD8uFJ9v/pMMNpR0CUkiNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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