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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d83a953479f7decaef93f3aff63496023bacdf12a452581be4c3282959699d5' 
  AND token = 'Gw0R8mQTaBB4cZ0rW2EICaT+e8OqJq+PeNRn2Eb07AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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