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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bcf4d3c0f7d1ce857fbc626ba788245c610fed778b1fe9e73a78dd573bdf4fd' 
  AND token = 'N9bmnvoZiZZhkGNUVohWMlrm7YI1/4HXO1ZeV+8heuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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