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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4f40c46f8b2f0bb1b3eaeee84b1f74d4d782e982cc2e82d95090b89d44e83e' 
  AND token = 'z99wrISsSlzK3q+jwv5tPSPivzK1kvyOi1z9ymcGySQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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