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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66636f33f4b80228ffb9b7f3cfa6a576509e986c3f4fd7a907b8233c4a2914ce' 
  AND token = 'fTTfNjIDUiYkAyKIU7/iWfapJrqksvqFl3A43LGDca0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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