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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da516cc1561cc43261a4a27865c2404afecd3084b1ede5ff1fa6ad93b31dbd28' 
  AND token = 'kmWbgkxf2CX2mlaojub6W3YehL+kP6vRJNPL7fdOVVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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