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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3545b797688610aa1b5f7d17cac95b08d0f1446462a3552bb8e1d7164e5d2650' 
  AND token = 'AuXnREjMdO11whei45xg7zZc3DyFZxdcOFg+Ok+OOVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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