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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b295029a841a77b397b97b3c608e8c8b934b49188774a4a2ffcb44a2e3935c' 
  AND token = 'uRyKacbr8HW+EX+kpNw60rI/kL2kZGoesXiTVRZ6RmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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