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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04572f10b1744144fd510ef253504b888a1c61c575e687ba9cd7c8cd1f566b2a' 
  AND token = 'Tx2/S/mMPivihCT1pOz6HTvP/PskCosyg5EMx9dAv8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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