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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ba9bb53426f063abf17b0942106dc3c851987c16d848f2b816937689ee320a' 
  AND token = 'fjiH128/D8nPkszWGiFVHlbLxmusorCxUb98GwniU58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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