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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a78a3488bd932c2f6cb23f01f50195b5d60959f63fff9646e77f7721a8150a' 
  AND token = 'Q4LS8VaNoioFJ3/JLlkoO759z7HpbDhadj7jHwYf4qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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