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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b820e972bf83a77d3fa78bd94d35f6de67ce2f3584f5dcbab243d25398aa277c' 
  AND token = 'oBSPv6cV7hAYV0ROxqdeC/v4MD05uf1LU/kOXzoyj/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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