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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7235ba694a23c415402cfc4d0c0fba337d9b74c2b26dd0f60bc6f42e61405dc1' 
  AND token = 'N6Al93fqaj1N3gaA2uG2Y/0D0vtipHYKxAzWy/03oGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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