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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd272ab0f79fdc801560b2b53397f280875c8f2d0559f86c27d8edde443636b' 
  AND token = 'XvyBW1vBR8P6PuZdUS2SaZGvt7Cg0c/H7XxUw+HeGZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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