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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb7ad012449f097c3671332a6f9b366f24687a0b0f09b979819d0a132556385' 
  AND token = 'YWaK5lM6AswvYjPMWIw7I88olxZIoevSXDDi58wADiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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