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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd27139f5a0f090207a4f872f1b278b9820d3866d76f30b3d95091b9f7effa3' 
  AND token = 'kJNdS890M9ERXjIT+r5f+yLt7neSSCkpTluE7NnRz5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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