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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f60826c2291f28fb9cceed2c891b82cf6097246a6f22007973cb170d463649d' 
  AND token = 'vZ2cAjB+D1DPD9OlxLPIOf6e50JskdBn0azIou0AejU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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