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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412c980a8b089905314642570bc1d1f68443095705d1accd3f913b7c9518a2d1' 
  AND token = 'dprHioijEJwAsP60QvTkQOs0FDnbrs2dXS+1jTKtkBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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