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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e580cc9d3a87390a8e334c6f8ba477922610cb968aee2f6dae1a3fd6e169ed' 
  AND token = 'M+rPsPZXYj7eWaG/V6vSAPZuolaffpySdJ5UHE/G/DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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